This is a study, in two volumes, of one of the longest standing philosophical problems: the problem of universals.

Part I. Preliminaries: 1. Predicates; Part II. Theories of Universals: 2. Predicate nominalism; 3. Concept nominalism; 4. Class nominalism; 5. Resemblance nominalism; 6. Arguments for realism; 7. Transcendent universals; 8. Properties and relations as particulars; Part III. Particulars: 9. Are particulars reducible to universals?; 10. The Lockean account of particulars; 11. Particulars and universals; 12. A world-hypothesis.